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Sisi miring (mi)
Sisi depan (de)
a
Sisi samping (sa)
Sin a = sisi depan
sisi miring
Cos a = sisi samping
sisi miring
Tan a = sisi depan
sisi samping
csc a = 1 = mi
sin a de
sec a = 1 = mi
cos a sa
cot a = 1 = sa
tan a de
90°
Kuadran I
Kuadran II
sin a dan csc a bertanda positif
Semua nilai perbandingan trogonometri bertanda positif
180°
0°
Kuadran III
Kuadran IV
tan a dan cot a bertanda positif
cos a dan sec a bertanda positif
270°
sin 90° − a = cos a
cos 90° − a = sin a
tan 90° − a = cot a
cot 90° − a = tan a
sec 90° − a = csc a
csc 90° − a = sec a
sin 180° − a = sin a
cos 180° − a = -cos a
tan 180° − a = -tan a
cot 180° − a = -cot a
sec 180° − a = -sec a
csc 180° − a = csc a
sin 180° + a = −sin a
cos 180° + a = −cos a
tan 180° + a = tan a
cot 180° + a = cot a
sec 180° + a = −sec a
csc 180° + a = −csc a
sin 360° − a = −sin a
cos 360° − a = cos a
tan 360° − a = −tan a
cot 360° − a = −cot a
sec 360° − a = sec a
csc 360° − a = −csc a
1. tan a = sin a
cos a
2. cot a = cos a
sin a
3. csc a = 1
sin a
4. sec a = 1
cos a
5. sin²a + cos²a = 1
6. 1 + tan²a = sec²a
7. 1 + cot²a = csc²a
C
a
b
B
A
c
a = b = c
sin A sin B sin C
a² = b² + c² - 2bc cos A
b² = a² + c² - 2ac cos B
c² = a² + b² - 2ab cos C
C
a
b
B
A
c
D
L = 1/2 b.c sin A
L = 1/2 a.c sin B
L = 1/2 a.b sin C
L = a² sin B sin C
2sin A
L = b² sin A sin C
2sin B
L = c² sin A sin B
2sin C
L = √s.(s-a).(s-b).(s-c)
s = 1/2 (a+b+c)